NURS215 Lecture Notes - Lecture 6: Fluid Balance, Hypovolemia, Molality

• School: University of Alberta
• Department: Nursing
• Course: NURS215
• Professor: Helena Schaefer

Document Summary

Figure 31. 1 major fluid compartments in the body. Primary regulators of fluid output: kidneys. Which patients will experience fluid balance issues: think big, chf, kidney disease, hemorrhage, burns, diuretics. Tx: replace electrolytes, fluid or nutrition, blood products. Concentration of osmotic solution: osmolality can be measured, expected osmolality is 275 295 mosm/kgh20. Dependent on number of dissolved solutes in a body fluid sodium !, glucose, urea re(cid:373)e(cid:373)(cid:271)er (cid:858)os(cid:373)osis(cid:859) Changes in osmolality can cause water to move to different compartments re(cid:373)e(cid:373)(cid:271)er (cid:858)os(cid:373)osis(cid:859) Eg: dehydration increases osmolality, overhydration decreases osmolality. Iv fluid administration aims to correct fluid imbalances: via osmosis. Mo(cid:448)(cid:859)t of h2o from lo(cid:449) solute to high solute (cid:894)(cid:858)dilutes(cid:859)(cid:895: choose the correct iv fluid to effect: Tonicity of iv fluid will achieve the desired shift. Colloids: supply proteins into ecf (circulation, aka plasma expanders, stay in circulation, tx: hypovolemic shock, contra. In most other cases d/t no pass via capillaries & renal impl.